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Champ Micro mod help

Discussion in 'Shock Brother's DIY Amps' started by ChuckWN, Nov 29, 2020.

  1. ChuckWN

    ChuckWN TDPRI Member

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    Really enjoying my Champ Micro.

    I would like to be able to get a lot more distortion without having the amp so loud that it makes my wife leave the room.

    Guidance requested.

    Thanks!
     
  2. elpico

    elpico Tele-Afflicted

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    some options:

    master volume pot @ power tube grid

    dirt pedal

    power scaling regulator

    attenuator

    inefficient speaker
     
  3. robrob

    robrob Poster Extraordinaire Ad Free Member

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    The Champ Micro has a master volume on the power tube grid so I don't understand.

    [​IMG]
     
    Paul-T likes this.
  4. smuc

    smuc Tele-Meister

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    Get a pedal?
     
  5. Paul-T

    Paul-T Tele-Holic

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    OP - have you tried cranking up the preamp gain and keeping the master volume low? ? ?
     
  6. Mongo Park

    Mongo Park Tele-Afflicted

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    Put in a headphone Jack.
    Some of the layouts on Rob’s most excellent site have them.
    Then your rockin and try are
    talkin
     
  7. ChuckWN

    ChuckWN TDPRI Member

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    So I have tried to turn the pre-amp gain all the way up and it adds a little distortion, but I would like a lot more. There is plenty of distortion available, but it gets too loud before getting there.

    My 1980 Fender 30 has a pre-amp gain knob with a pull for boost feature. Quite a lot of distortion on this amp with the master volume all the way down.

    Really hoping to avoid using a petal to keep the pure tube sound. IMG_1531 copy copy.jpeg
     
  8. Paul-T

    Paul-T Tele-Holic

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    Perhaps Rob will chip and contribute an expert view...

    do you have the 12AY7 or the 12AX7 for your preamp valve? If you need more gain, the latter would do it.
     
  9. ThermionicScott

    ThermionicScott Poster Extraordinaire

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    Add another gain stage. Most of the distortion in a stock Champ comes from the output tube overdriving, and even that doesn't get very saturated.
     
    dan40 likes this.
  10. dan40

    dan40 Friend of Leo's

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    The extra distortion that you begin to hear as the amp starts to get too loud is the power tube distorting. You will likely need to add an attenuator between the amp and speaker to tame the volume.
     
  11. robrob

    robrob Poster Extraordinaire Ad Free Member

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    You can add a clean boost pedal to make the master volume more effective. A hot humbucker will also help.
     
  12. ChuckWN

    ChuckWN TDPRI Member

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    Switched out the 12AY7 and installed a cheepo (low quality) 12AX7. This helped quite a bit. I see clean boost pedals for $17 on amazon. Probably worth a try.

    Thanks for the advice everyone.
     
    robrob likes this.
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